The Varying Effects of Uniaxial Compressive Stress on the Bainitic Transformation under Different Austenitization Temperatures

In this study, thermal simulation experiments under different austenitization temperatures and different stress states were conducted. High-temperature laser scanning confocal microscopy (LSCM), thermal dilatometry, and scanning electron microscope (SEM) were used to quantitatively investigate the effects of the uniaxial compressive stress on bainitic transformation at 330 °C following different austenitization temperatures. The transformation plasticity was also analyzed. It was found that the promotion degree of stress on bainitic transformation increases with the austenitization temperature due to larger prior austenite grain size as well as stronger promoting effect of mechanical driving force on selected variant growth at higher austenitization temperatures. The grain size and the yield strength of prior austenite are other important factors which influence the promotion degree of stress on bainitic transformation, besides the mechanical driving force provided by the stress. Moreover, the transformation plasticity increases with the austenitization temperature.

[1]  Guang Xu,et al.  The effects of external compressive stress on the kinetics of low temperature bainitic transformation and microstructure in a superbainite steel , 2015 .

[2]  Guang Xu,et al.  New insights to the effects of ausforming on the bainitic transformation , 2015 .

[3]  P. Hodgson,et al.  Acceleration of the super bainite transformation through a coarse austenite grain size , 2014 .

[4]  O. Bouaziz,et al.  Mechanical Behavior of Carbide-free Medium Carbon Bainitic Steels , 2014, Metallurgical and Materials Transactions A.

[5]  F. Liu,et al.  In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel , 2013, International Journal of Minerals, Metallurgy, and Materials.

[6]  F. Liu,et al.  A new approach to quantitative analysis of bainitic transformation in a superbainite steel , 2013 .

[7]  M. Hermans,et al.  Kinetics of bainitic transformation and transformation plasticity in a high strength quenched and tempered structural steel , 2013 .

[8]  H. Maier,et al.  In situ characterization of backstress effects on the austenite-to- bainite phase transformation , 2012 .

[9]  H. Maier,et al.  In-situ characterization of transformation plasticity during an isothermal austenite-to-bainite phase transformation , 2012 .

[10]  F. Hu,et al.  Nanostructured high-carbon dual-phase steels , 2011 .

[11]  H. Maier,et al.  Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel , 2011 .

[12]  H. Maier,et al.  Pre-deformation-transformation plasticity relationship during martensitic transformation , 2010 .

[13]  Hans Jürgen Maier,et al.  Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation , 2009 .

[14]  H. Bhadeshia,et al.  Crystallographic texture of stress-affected bainite , 2007, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[15]  E. Aeby-Gautier,et al.  Morphology changes in bainite formed under stress , 2006 .

[16]  T. Hsu Additivity hypothesis and effects of stress on phase transformations in steel , 2005 .

[17]  H. Bhadeshia,et al.  Bainite formation influenced by large stress , 2004 .

[18]  H. K. D. H. Bhadeshia,et al.  Developments in martensitic and bainitic steels: role of the shape deformation , 2004 .

[19]  R. Larn,et al.  The effect of compressive deformation of austenite on the bainitic ferrite transformation in FeMnSiC steels , 2000 .

[20]  H. Bhadeshia,et al.  The effect of small stresses on the kinetics of the bainite transformation , 1995 .

[21]  H. Bhadeshia,et al.  Stress affected bainitic transformation in a FeCSiMn alloy , 1994 .

[22]  R. W. Reed,et al.  Stress induced transformation to bainite in Fe–Cr–Mo–C pressure vessel steel , 1991 .

[23]  H. Bhadeshia,et al.  Bainite in Steels , 2019 .

[24]  B. Sandvik The Bainite reaction in Fe-Si-C Alloys: The primary stage , 1982 .

[25]  C. M. Wayman,et al.  The crystallography of the bainite transformation—I , 1968 .

[26]  Morris Cohen,et al.  Criterion for the action of applied stress in the martensitic transformation , 1953 .